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Some neurons (delay cells) in the prefrontal cortex elevate their activities throughout the time period during which the animal is required to remember past events and prepare future behavior, suggesting that working memory is mediated by continuous neural activity. It is unknown, however, how working memory is represented within a population of prefrontal(More)
A 1.9-GHz CMOS differential power amplifier for a polar transmitter is implemented with a 0.18-mum RF CMOS process. All of the matching components, including the input and output transformers, are fully integrated. The concepts of injection locking and variable load are applied to increase the efficiency and dynamic range of the amplifier. An asymmetric(More)
In this paper, a novel monolithic voltage-boosting parallel-primary transformer is presented for the fully integrated CMOS power amplifier design. Multiple primary loops are interweaved in parallel to combine the AC currents from multiple power devices while the higher turn ratio of a secondary loop boosts AC voltages of the combined primary loops at the(More)
A highly-linear RF envelope detector for amplitude modulation of multiple wireless standards is presented. The RF envelope detector employs a differential voltage-to-current converter and a current-mode full-wave rectifier to enhance linearity of output envelope signal. It is shown that the proposed RF envelope detector linearly tracks 5-MHz sine-wave(More)
Spectrum sensing is a key function for a cognitive radio (CR) system. An analog-based multi-resolution spectrum sensing (MRSS) technique was proposed as a flexible, low-power, high-speed spectrum-sensing solution. In this paper, implementation issues of the MRSS technique are investigated, and the corresponding practical specifications are suggested. First,(More)
The highly efficient CMOS Power Amplifier Module (PAM) is designed for quad-band cellular handsets comprising GSM850, EGSM, DCS, PCS and supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. This module integrates an input matching network, a complete power control, and a thermal, over current, and load mismatch protection in a(More)
A 1.8-GHz CMOS power amplifier for a polar transmitter is implemented with a 0.18- RF CMOS process. The matching components, including the input and output transformers, were integrated. A dual-primary transformer is proposed in order to increase the efficiency in the low power region of the amplifier. The loss induced by the matching network for the(More)